You’ll see a few names used for shipping envelopes, and each points to how they’re built:

• Poly mailers: Lightweight plastic mailing envelopes that are flexible and often self-sealing. Many are designed to resist tears and light moisture.
• Bubble mailers: Envelopes lined with bubble cushioning for extra protection. They come with either a plastic (poly) or paper (kraft) exterior.
• Kraft bubble mailers: Bubble-lined mailers with a paper exterior for a traditional look and easy handwriting.
• Rigid/stay-flat mailers: Stiffer mailers that help keep photos or documents from bending.
• Padded envelopes: A general term for mailers with internal cushioning.

Names can overlap, so it helps to check the product’s features, size, and padding.

A quick measure-and-match approach can help you pick the right fit:

1. Measure your item: Note length, width, and thickness at the widest points.
2. Add breathing room: Leave about 0.5–1 inch for closure and bulk; size up for thicker items.
3. Account for padding: Bubble mailers have less internal space than their exterior size.
4. Use common size cues: Examples you’ll find include #0 (6" x 9"), #2 (8.5" x 11"), #5 (10.5" x 15"), #6 (12.5" x 18.5"), and larger options around 14.25" x 19". Dimensions can vary by style.
5. Check listed dimensions: Compare the product’s interior/exterior measurements to your item.

When in doubt, choosing the next size up can make packing easier.

It depends on what you’re shipping and how much cushioning you want:

• Poly mailers: Great for soft, non-fragile items like clothing, fabrics, or accessories. They’re lightweight, flexible, and typically self-seal, which can simplify packing.
• Bubble mailers: Ideal when you want built-in cushion for smaller items—think books, beauty items, or boxed goods that could use extra protection.
• Kraft bubble styles: A paper exterior some people prefer for handwriting addresses.
• Rigid/stay-flat mailers: Helpful for documents, photos, or prints you don’t want bent.

For delicate items, adding internal padding or using a box can provide additional protection, depending on the item and transit conditions.

These are general-purpose mailing envelopes used for everyday shipping. Compatibility usually depends on your carrier’s size, weight, and labeling requirements.

• Check guidelines: Review your carrier’s limits for dimensions, thickness, and weight before shipping.
• Labeling: Leave a smooth, flat area for a shipping label. Wipe surfaces dry so labels adhere more reliably.
• Sealing: Many have peel-and-seal closures; adding tape can provide extra hold for heavier or stuffed parcels.
• Contents: Avoid overfilling; items that are too bulky may not process as intended.

Standards can vary by service and destination, so verifying details with your chosen carrier can help prevent delays.

Yes, you’ll find multi-packs and variety sets on this page in a wide range of counts and sizes.

• Multi-packs: Convenient for frequent shippers and small businesses; they help keep packing supplies on hand.
• Variety packs: Useful when you ship different items and want multiple sizes in one purchase.
• Planning: Estimate weekly shipments and choose counts that reduce last-minute reorders.
• Storage tips: Store flat in a cool, dry place and keep the adhesive strip clean until use to help maintain closure performance.

If you’re trying new sizes, starting with a mixed set can help you learn which dimensions you reach for most often.